[Tex/LaTex] No Line Break in Author Command? It goes off the page!

ieeetrantitles

This answer by @AndrewSwann demonstrates use of the \author{} command. I am writing an article with a bunch of authors, and when I use this command, it goes off the page:

enter image description here

How can I fix this? Using the same code with more authors:

\documentclass[conference]{IEEEtran}

\begin{document}
\title{An Important Conference Contribution}

\author{\IEEEauthorblockN{Author One\IEEEauthorrefmark{1},
Author Two\IEEEauthorrefmark{2}, Author Three\IEEEauthorrefmark{1},
Author Four\IEEEauthorrefmark{2}, Author Five\IEEEauthorrefmark{1},
Author Six\IEEEauthorrefmark{2}, Author Seven\IEEEauthorrefmark{1},
Author Eight\IEEEauthorrefmark{2}, Author Nine\IEEEauthorrefmark{3} and
Author Ten\IEEEauthorrefmark{4}}
\IEEEauthorblockA{Department of Whatever,
Whichever University\\
Wherever\\
Email: \IEEEauthorrefmark{1}author.one@add.on.net,
\IEEEauthorrefmark{2}author.two@add.on.net,
\IEEEauthorrefmark{3}author.three@add.on.net,
\IEEEauthorrefmark{4}author.four@add.on.net}}
\maketitle

\end{document}